The specialist who performed Collins' neck surgery advised the ex-Packer to to end his pursuit of an NFL comeback following a recent examination. Collins had been training regularly at IMG Academy in Florida, though that training ceased after the latest examination.

Collins was injured Sept. 18, 2011, while attempting to make a tackle against the Carolina Panthers. Collins remained down for several minutes before being carted off the field. The injury required surgery on a herniated disk in his neck.

The Packers have struggled to fill Collins' void in their secondary. It wasn't so long ago that the three-time Pro Bowl safety was returning an interception for a touchdown in the Super Bowl. Collins had 21 career interceptions, returning three for touchdowns in 2008.

It now appears he'll be forced to take his life in a different direction.